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https://issues.apache.org/jira/browse/CASSANDRA-14724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617504#comment-16617504
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Benedict commented on CASSANDRA-14724:
--------------------------------------

Do we accept do any TZ conversion?  If not, I guess we just need to annotate 
these classes with comments indicating that - should we ever support TZs - we 
need to create a new Duration type and deprecate this one.

> Duration addition to Date/Timestamp is broken for leapseconds
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-14724
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14724
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benjamin Lerer
>            Priority: Major
>              Labels: correctness
>
> Hours, Minutes and Seconds are not always of the same duration; it varies 
> when they cross a leap second (or DST boundary).  When we add durations to 
> instants, we do not account for this (as we have by then lost the necessary 
> information).  Duration should take (and store) all components of time.



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